Plastic Dome Bolt Nut Protection Cap M6 / 10mm Hex Screw Cover Black 100pcs - Bed Bath & Beyond - 36725203
Replacement Toilet Bowl Bolt Caps and Tops in many colors
Front Fork Tube Top Bolt Honda CB175 / CL175 / CB200 / CB360 / CL360 / CB450 / CL450 / CB550 | Common Motor Collective
Hex-Caps Bolt Covers | Pro-Dec
Fluidmaster Secure Cap Universal Toilet Bolt Caps - White Plastic - Easy to Install - Universal Fit - Replace Lost or Broken Bolt Caps - Toilet Hardware & Accessories in the Toilet